| Values for Old Faithful Area | 1977-03-20 |
|---|---|
| Astronomical Twilight Begin | 04:47 |
| Nautical Twilight Begin | 05:22 |
| Civil Twilight Begin | 05:56 |
| Sunrise | 06:25 |
| Sunset | 18:35 |
| Civil Twilight End | 19:04 |
| Nautical Twilight End | 19:38 |
| Astronomical Twilight End | 20:13 |
| Moon Illumination | 0.27% |